磁鼓在启动或停止时由于磁头和鼓面相碰造成磨损是计算机磁鼓存储器中最常出现的毛病。为了解决这个问题,Bryant 公司最近研制了一种不是圆柱形而是截锥形的磁鼓。利用自动升降机构使磁鼓在启动和停止期间和磁头保持有一个安全的空隙,从而保证磁鼓可靠地长期工作。在具有自动升降机构和截锥式外形的磁鼓系统中,磁鼓可相对于磁头移动。只要当磁鼓转速低于一定数值时,磁鼓和磁头间的空隙就会自动增加,形成 Drum damage caused by head-to-drum contact when the drum is started or stopped is the most common occurrence in computer drum memory. To solve this problem, Bryant recently developed a cylinder that is not cylindrical but has a truncated conical shape. The use of automatic lifting mechanism so that the drum during the start and stop with the head to maintain a safe gap, thus ensuring the drum long-term reliable work. In a drum system with an automatic lift mechanism and truncated cone profile, the drum can be moved relative to the head. As long as the drum speed below a certain value, the gap between the drum and head will automatically increase to form